Damage mode identification of composite wind turbine blade under accelerated fatigue loads using acoustic emission and machine learning

2019 ◽  
Vol 19 (4) ◽  
pp. 1092-1103 ◽  
Author(s):  
Pengfei Liu ◽  
Dong Xu ◽  
Jingguo Li ◽  
Zhiping Chen ◽  
Shuaibang Wang ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Mode Identification ◽  
Emission Signal ◽  
Composite Blade ◽  
Acoustic Emission Sensors ◽  
Safety Precaution ◽  
Fatigue Loads

This article studies experimentally the damage behaviors of a 59.5-m-long composite wind turbine blade under accelerated fatigue loads using acoustic emission technique. First, the spectral analysis using the fast Fourier transform is used to study the components of acoustic emission signals. Then, three important objectives including the attenuation behaviors of acoustic emission waves, the arrangement of sensors as well as the detection and positioning of defect sources in the composite blade by developing the time-difference method among different acoustic emission sensors are successfully reached. Furthermore, the clustering analysis using the bisecting K-means method is performed to identify different damage modes for acoustic emission signal sources. This work provides a theoretical and technique support for safety precaution and maintaining of in-service blades.

Dynamic Analysis for Wind Turbine Composite Blade

2013 ◽  
Vol 364 ◽  
pp. 102-106 ◽  
Author(s):  
Li Qun Zhou ◽  
Shuai Heng Xing ◽  
Yu Ping Li
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Inertia Force ◽  
Rotational Inertia ◽  
Fiber Layer ◽  
Composite Blade ◽  
Nature Frequency ◽  
The Relationship ◽  
Blade Model

Wind turbine blade model is analyzed based on finite element method. Research and comparison of blade natural frequencies is made in different rotational working conditions taking into account external factors such as the rotational inertia force. Also the relationship between the composite ply angle and natural frequency is analyzed. The result shows that the nature frequency of wind turbine blade is influence greatly by the stress stiffening effect for the blade rotation. And the nature frequency of wind turbine blade can be designed by adjusting the single fiber layer ply angle of blade.

RANCANGAN DAN ANALISIS STRUKTUR SUDU TURBIN ANGIN LPN 10000 E

2010 ◽  
Vol 3 (2) ◽  
Author(s):  
Sulistyo Atmadi ◽  
Firman Hartono
Keyword(s):  
Structural Analysis ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Safety Factor ◽  
Bending Moment ◽  
High Strength ◽  
Wind Turbine Blade ◽  
Unidirectional Reinforcement ◽  
Composite Blade ◽  
Operational Load

Structure of the LPN 10000 E wind turbine blade has been manufactured and its structural analysis to find out the strenght of this structure during its operation has also been conducted. The method of aero bending moment and centrifugal bending moment and load has been used while neglegting frcitional and torsional load. The analysis is obtained for composite blade strengthened by high strength carbon unidirectional reinforcement composite. With safety factor of 1.3 minimum, it was concluded that the blade is strong enough to use at its designed operational load.

An Identification Method of Appearances and Expansion of Fatigue Crack in the Wind Turbine Blade Based on Fractal Feature

2012 ◽  
Vol 591-593 ◽  
pp. 2123-2126
Author(s):  
Bo Zhou ◽  
Chang Zheng Chen ◽  
Quan Gu ◽  
Huan Liu
Keyword(s):  
Acoustic Emission ◽  
Fractal Dimension ◽  
Fatigue Crack ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Correlation Dimension ◽  
Wind Turbine Blade ◽  
Crack Identification ◽  
Simplified Method ◽  
Fatigue Experiment

In this work an efficient and simplified method for crack identification in wind turbine blade has been developed based on fractal dimension. Firstly, the algorithm is studied on the calculation of the correlation dimension of acoustic emission signals, and an analysis of these equations makes it possible to identify cracks. Then it turns out that the complexity could vary with different crack expansion conditions, i.e. reduction and augmentation of the correlation dimension due to the occurrence of a crack by the fatigue experiment. Finally, the proposed detection methodology is compared to wavelet analysis. It is testified that the method exploits both the typical steady expansion of the crack and the appearance phenomenon due to the presence of crack.

Research on Forming Technology of Thermoplastic Composite Blade for Wind Turbine

2013 ◽  
Vol 328 ◽  
pp. 139-143
Author(s):  
Hai Tang Cen ◽  
Xiao Liang Wang ◽  
Zhi Yong Hu
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
High Performance ◽  
Wind Turbine Blade ◽  
Thermoplastic Composite ◽  
Deformation Model ◽  
Thermoplastic Resin ◽  
Forming Process ◽  
Composite Blade ◽  
Forming Technology

Thermoplastic composite has become preferred material for wind turbine blade with high performance, low cost and greenization. The fused mass of the thermoplastic resin has high viscosity and the forming of the thermoplastic composite materials is laborious, quality is not readily guaranteed, thus, the widespread use of thermoplastic composite blades for wind turbine is restricted. Based on the analysis of all kinds of the characteristics of thermoplastic forming technology, the paper has points out that the diaphragm forming is especially suitable for making a hyperboloid, variable thickness, large size wind turbine thermoplastic composite blade structure. The key to improving the forming quality and the efficiency of the thermoplastic blade forming is to establish finite element deformation model of a diaphragm forming process, to effectively control the process parameters such as temperature, pressure, forming rate. Conducting research on thermoplastic blade diaphragm forming technology lay the foundation for the industrialization of thermoplastic wind turbine blade.

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